With iOS 11, Apple made a change in how the Control Center worked. Buttons that had previously turned off Wi-Fi and Bluetooth now only prevented new connections, keeping the radios switched on so that features such as AirDrop, Personal Hotspot, and Handoff continue to work, and the Apple Watch and Apple Pencil continue to work.

What’s more, turning off Wi-Fi and Bluetooth using Control Center was only temporary, and would turn back on under the following conditions:

Wi-Fi:

• Wi-Fi is switched back on in Control Center
• You connect to a Wi-Fi network using Settings > Wi-Fi
• You walk or drive to a new location
• It’s 5 AM local time
• The iOS device is restarted

Bluetooth:

• Bluetooth is switched back on in Control Center
• You connect to a Bluetooth accessory in Settings > Bluetooth
• It’s 5 AM local time
• The iOS device is restarted

Permanently turning off Wi-Fi and Bluetooth involves going into the Settings app ( Settings > Wi-Fi and Settings > Bluetooth) and toggling the relevant buttons.

As you can imagine, this caused a lot of user confusion, especially since the only place where Apple had documented this change was on a support page that average users are never going to see.

As is the norm with poorly thought out user interface changes, Apple has had to make a few tweaksin iOS 11.2.

Here are the changes.

• First, a one-off popup explaining the changes
• A small notification at the top of the Control Center screen

More information on this change here.